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參數資料
| 型號： | TPS51200DRCTG4 |
| 廠商： | TEXAS INSTRUMENTS INC |
| 元件分類： | 模擬信號調理 |
| 英文描述： | SPECIALTY ANALOG CIRCUIT, PDSO10 |
| 封裝： | GREEN, PLASTIC, VSON-10 |
| 文件頁數： | 33/35頁 |
| 文件大小： | 1131K |
| 代理商： | TPS51200DRCTG4 |
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DETAILED DESCRIPTION
VO SINK/SOURCE REGULATOR
REFERENCE INPUT (REFIN)
REFERENCE OUTPUT (REFOUT)
SOFT-START
EN CONTROL (EN)
POWERGOOD FUNCTION (PGOOD)
VO CURRENT PROTECTION
VIN UVLO PROTECTION
SLUS812 – FEBRUARY 2008
The TPS51200 is a sink/source tracking termination regulator specifically designed for low input voltage,
low-cost, and low external component count systems where space is a key application parameter. The
TPS51200 integrates a high-performance, low-dropout (LDO) linear regulator that is capable of both sourcing
and sinking current. The LDO regulator employs a fast feedback loop so that small ceramic capacitors can be
used to support the fast load transient response. To achieve tight regulation with minimum effect of trace
resistance, a remote sensing terminal, VOSNS, should be connected to the positive terminal of the output
capacitor(s) as a separate trace from the high current path from VO.
The output voltage, VO, is regulated to REFOUT. When REFIN is configured for standard DDR termination
applications, REFIN can be set by an external equivalent ratio voltage divider connected to the memory supply
bus (VDDQ). The TPS51200 supports REFIN voltage from 0.5 V to 1.8 V, making it versatile and ideal for many
types of low-power LDO applications.
When it is configured for DDR termination applications, REFOUT generates the DDR VTT reference voltage for
the memory application. It is capable of supporting both a sourcing and sinking load of 10 mA. REFOUT
becomes active when REFIN voltage rises to 0.390 V and VIN is above the UVLO threshold. When REFOUT is
less than 0.375 V, it is disabled and subsequently discharges to GND through an internal 10-k
MOSFET.
REFOUT is independent of the EN pin state.
The soft-start function of the VO pin is achieved via a current clamp. The current clamp allows the output
capacitors to be charged with low and constant current, providing a linear ramp-up of the output voltage. When
VO is outside of the powergood window, the current clamp level is one-half of the full overcurrent limit (OCL)
level. When VO rises or falls within the PGOOD window, the current clamp level switches to the full OCL level.
The soft-start function is completely symmetrical; it works not only from GND to the REFOUT voltage, but also
from VLDOIN to the REFOUT voltage.
When EN is driven high, the TPS51200 VO regulator begins normal operation. When EN is driven low, VO is
discharges to GND through an internal 18-
MOSFET. REFOUT remains on when EN is driven low.
The TPS51200 provides an open-drain PGOOD output that goes high when the VO output is within ±20% of
REFOUT. PGOOD de-asserts within 10
s after the output exceeds the size of the powergood window. During
initial VO startup, PGOOD asserts high 2 ms (typ) after the VO enters power good window. Because PGOOD is
an open-drain output, a 100-k
, pull-up resistor between PGOOD and a stable active supply voltage rail is
required.
The LDO has a constant overcurrent limit (OCL). Note that the OCL level reduces by one-half when the output
voltage is not within the powergood window. This reduction is a non-latch protection.
For VIN undervoltage lockout (UVLO) protection, the TPS51200 monitors VIN voltage. When the VIN voltage is
lower than the UVLO threshold voltage, both the VO and REFOUT regulators are powered off. This shutdown is
a non-latch protection.
Copyright 2008, Texas Instruments Incorporated
7
Product Folder Link(s): TPS51200
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相關代理商/技術參數 |
參數描述 |
|---|---|
| TPS51200EVM | 功能描述:電源管理IC開發工具 TPS51200 Sink Source DDR Term Reg RoHS:否 制造商:Maxim Integrated 產品:Evaluation Kits 類型:Battery Management 工具用于評估:MAX17710GB 輸入電壓: 輸出電壓:1.8 V |
| TPS51200MDRCTEP | 功能描述:- Converter, DDR Voltage Regulator IC 1 Output 10-VSON (3x3) 制造商:texas instruments 系列:- 包裝:剪切帶（CT） 零件狀態:新產品 應用:轉換器，DDR 電壓 - 輸入:2.38 V ~ 3.5 V 輸出數:1 電壓 - 輸出:- 工作溫度:-55°C ~ 125°C 安裝類型:表面貼裝 封裝/外殼:10-VFDFN 裸露焊盤 供應商器件封裝:10-VSON（3x3） 標準包裝:1 |
| TPS51200-Q1 | 制造商:TI 制造商全稱:Texas Instruments 功能描述:SINK/SOURCE DDR TERMINATION REGULATOR |
| TPS51200QDRCRQ1 | 功能描述:低壓差穩壓器 - LDO AC Sink/Source DDR RoHS:否 制造商:Texas Instruments 最大輸入電壓:36 V 輸出電壓:1.4 V to 20.5 V 回動電壓（最大值）:307 mV 輸出電流:1 A 負載調節:0.3 % 輸出端數量: 輸出類型:Fixed 最大工作溫度:+ 125 C 安裝風格:SMD/SMT 封裝 / 箱體:VQFN-20 |
| TPS51200QDRCRQ1 | 制造商:Texas Instruments 功能描述:IC DDR TERMINATION 3A SON-10 制造商:Texas Instruments 功能描述:IC, DDR TERMINATION, 3A, SON-10 |
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